US20090323311A1 - Side-emitting led display - Google Patents
Side-emitting led display Download PDFInfo
- Publication number
- US20090323311A1 US20090323311A1 US12/436,429 US43642909A US2009323311A1 US 20090323311 A1 US20090323311 A1 US 20090323311A1 US 43642909 A US43642909 A US 43642909A US 2009323311 A1 US2009323311 A1 US 2009323311A1
- Authority
- US
- United States
- Prior art keywords
- optical radiation
- primary
- diffusing reflector
- display panel
- diffusing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- G—PHYSICS
- G12—INSTRUMENT DETAILS
- G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
- G12B11/00—Indicating elements; Illumination thereof
- G12B11/02—Scales; Dials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
- B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
- B60Q3/14—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards lighting through the surface to be illuminated
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
- G01D11/28—Structurally-combined illuminating devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D13/00—Component parts of indicators for measuring arrangements not specially adapted for a specific variable
- G01D13/02—Scales; Dials
- G01D13/12—Graduation
- G01D13/20—Graduation with luminescent markings
Abstract
Description
- This application claims the benefit of United Kingdom Patent Application No. 0811866.3 filed on Jun. 27, 2008, hereby incorporated herein by reference in its entirety.
- The present invention related to the field of the illuminating of displays, and in particular to displays having a back-lit display medium.
- Displays are often provided with backlighting, used to provide illumination through clear or translucent portions of components forming the display. Examples include liquid crystal displays (LCD's), or indication displays having an appliqué with transparent or translucent portions through which the backlit illumination passes.
- Examples in the field of automotive displays include LCD displays for displaying alphanumeric of graphical information, and speedometer or engine speed (rpm) displays having translucent numeric indications.
- Traditionally, such displays have been illuminated with incandescent bulbs, although with the emergence of solid state light sources, there has been a considerable increase in the usage of light emitting diodes (LEDs), both colored and white LEDs, because of their compact size and long lifetime.
- The display is usually part of a display module seated inside a dashboard assembly. The depth for the display module may be limited because of the space required behind the display for wiring or ducting, and in any event it is desirable to limit the depth of the display.
- Display modules comprise normally a rigid or flexible printed circuit carrier, for example printed flex strip or a rigid printed circuit board (PCB) with conduction tracks and components on one or both sides. The number of light sources required to evenly illuminate a graphical information area of vehicle instrument clusters is proportional to the surface area of the graphics. Conventionally, to provide even backlight illumination over an area of a typical automotive dashboard display, and array of LEDs is used beneath the graphical area even illumination. The use of multiple LEDs may also be desirable because then there can be some overlap between the illumination provided by the LEDs.
- White LED's are, however, considerably more expensive than incandescent bulbs, and so it is in almost all causes uneconomic simply to replace each incandescent light with an LED. To reduce cost, fewer LEDs may be used but at the expense of sacrificing the illumination homogeneity. The manufacturing process for white LED's also leads to some inevitable hue variation in the shade of white produced by different LED's. This can lead to unpredictable color variations across a backlit display. Therefore, the use of white LED's in backlit display applications has in practice been limited to small area displays both for reasons of cost and for color uniformity.
- Most conventional instrument clusters are illuminated using several light sources arranged into a circular array of LED sources beneath the graphical information area. One way to reduce the number of LED sources is to use a balancing technique. The balancing consists on darkening the bright spots to the level of the low brightness spots but this method suffers from a noticeable colour shift that occurs when a polychromatic source is employed such as white light which is due to the difference in the spectrum of absorption of light induced by the additional painting or darkening layers.
- Another way to reduce further the number of LED sources used, and therefore the cost, whilst maintaining a uniform distribution of light over a given area, is to use light guides. Light guide solutions are disclosed in JP 2001281008 and US 20040228104. Such techniques efficiently use the available optical power of an LED but require additional design, assembly and tooling costs. Furthermore, light guides are not scalable as these need to be precisely designed for each application and depend critically on the size of the area to be illuminated.
- Another solution is to use indirect illumination as disclosed in U.S. Pat. No. 6,595,667, WO 9926809, and WO2005002903. The indirect illumination employs fewer LED sources that are located near the center of the gauge where the emitted light is reflected and diffused in the outward direction by a diffusing deflector. The drawback of this method is that part of the light emitted by the LED is transmitted without being diffused or reflected by the diffusing reflector, and therefore produces uneven illumination and color shift.
- It would be desirable to develop a backlit display that maintains a suitable illumination homogeneity while minimizing the number of required light sources.
- Concordant and consistent with the present invention, a backlit display that maintains a suitable illumination homogeneity while minimizing the number of required light sources, has surprisingly been discovered.
- In one embodiment, a display unit comprises: a display panel including a graphical information display area for displaying graphical information to a user of the unit; a diffusing means including a primary diffusing reflector and a secondary diffusing reflector disposed adjacent the display panel, wherein the primary diffusing reflector extends transversely away from the display panel; and a source of optical radiation spaced from the diffusing means, the source of optical radiation having an emitting side that faces in a lateral direction with respect to the extent of the display panel and towards the primary diffusing reflector and so that optical radiation from the source of optical radiation is directed toward the primary diffusing reflector.
- In another embodiment, a display unit comprises: a display panel including a graphical information display area for displaying graphical information to a user of the unit; a diffusing means including a primary diffusing reflector and a secondary diffusing reflector disposed adjacent the display panel, wherein the primary diffusing reflector extends transversely away from the display panel; and a source of optical radiation supported by a carrier and spaced from the diffusing means, the source of optical radiation having an emitting side that faces in a lateral direction with respect to the extent of the display panel and towards the primary diffusing reflector and so that optical radiation from the source of optical radiation is directed toward the primary diffusing reflector.
- In yet another embodiment a display unit comprises a display panel including a graphical information display area for displaying graphical information to a user of the unit and an optical system for providing diffuse back-light illumination to the display area, the optical system including a source of optical radiation and a diffusing means for diffusing the optical radiation, the diffusing means including at least one diffusing reflector behind the display panel, wherein the at least one diffusing reflector includes a primary diffusing reflector, the primary diffusing reflector extending transversely away from the display panel, and the source of optical radiation is spaced from the diffusing means and includes at last one light emitting diode having an emitting side that faces in a lateral direction with respect to the extent of the display panel and towards the primary diffusing reflector and so that the optical radiation from the LED falls initially on the primary diffusing reflector.
- The invention offers a number of advantages. The direction of the emitted optical radiation towards the primary diffusing reflector prevents direct un-diffused illumination emitted by the LED from reaching the graphical information display areas, and this helps to ensure evenness of illumination.
- Other advantages stem from the lateral direction of the emitted optical radiation from the primary diffuser. The optical radiation from an LED will naturally have a certain spread, for example about a beam axis, which is preferably oriented to be normal to the primary diffuser surface. Optical radiation from the LED traveling in a direction laterally away from the graphical information display area will then be essentially entirely incident on the primary diffuser reflector, which preferably bounds along one side of the graphical information display area. The diffuse reflector, being oriented transverse, and most preferably perpendicular, to the display panel will therefore also diffusely reflect the optical radiation, primarily in a direction that is oppositely lateral to the direction of the optical radiation originally incident on the primary diffusive reflector. The predominantly lateral direction of both the incident optical radiation and diffuse reflection helps to spread the optical radiation over the display panel and graphical information areas while minimizing the size of the display unit in the direction transverse to the display panel. As a result, the thickness and complexity of the display unit can be minimized and the number of LEDs reduced whilst providing an even back-lighting for the graphical information display area. To help further minimize the required thickness of the display unit, the primary diffusing reflector may be located immediately behind the graphical information display area.
- In a preferred embodiment of the invention, the LED is a side-emitting LED. This is particularly suitable for providing the laterally directed illumination described above.
- Also in a preferred embodiment of the invention, the display unit comprises additionally a carrier for supporting the (or each) LED. The carrier, which may be a printed circuit board (PCB), includes traces for powering the LED. The LED is then electrically mounted on the carrier with and emitting side of the LED extending upright from the carrier and facing towards the primary diffusing reflector. The carrier will most commonly be a planar carrier, although this may be shaped as required to fit with other adjacent components of the display unit.
- The primary diffusing reflector may adjoin the carrier and/or the display panel.
- The optical diffusing system may include a secondary diffusing reflector that is arranged to receive at least some of the optical radiation diffused by the primary diffusing reflector and to reflect this optical radiation towards the display panel. In a preferred embodiment of the invention, the (or each) LED is located between the primary and secondary diffusing reflectors.
- The above, as well as other advantages of the present invention, will become readily apparent to those skilled in the art from the following detailed description of the preferred embodiment when considered in the light of the accompanying drawings in which:
-
FIG. 1 is a partially cut-away perspective view of a display unit according to an embodiment of the present invention; and -
FIG. 2 is a cross-section view of the display unit ofFIG. 1 - The following detailed description and appended drawings describe and illustrate various embodiments of the invention. The description and drawings serve to enable one skilled in the art to make and use the invention, and are not intended to limit the scope of the invention in any manner.
-
FIGS. 1 and 2 show adisplay unit 1 including adisplay panel 2 having a graphicalinformation display area 3 for displaying graphical information to a user of the unit. An optical system is used to provide diffuse back-light illumination 8 to thedisplay area 3. As shown, aportion 10 of the back-light illumination 8 passes through a plurality ofareas 12 of relatively high transmittance in thedisplay panel 2 to present graphical information to a user of thedisplay unit 1. - The
display panel 2 has a translucent upper layer 14 a lower side of which is covered by one of more layers of anopaque paint 15. Thepaint 15 is absent in theareas 12 having relatively higher transmittance. Atransparent cover 7 protects the translucentfront panel layer 14 bearing the graphicalinformation display area 3. - The optical system of the
display unit 1 includes up to six, but preferably four, side-emittingLEDs 5 to provide anoptical radiation 16 that is used to provide the back-light illumination 8 to thedisplay panel 2. However, other sources of theoptical radiation 16 may be used. Diffusing means are provided for diffusing the optical radiation, including a plurality of diffusingreflectors display panel 2. - One of the reflectors is a
primary diffusing reflector 18 on which theoptical radiation 16 from theLEDs 5 is directly incident. The other of the diffusingreflectors secondary diffusing reflector 19 arranged to receive and reflectively diffuse theoptical radiation 16 previously scattered by theprimary diffusing reflector 18 and thepaint coat 15, which preferably includes an outermost painted layer that is highly efficient at reflectively scattering the wavelengths of theoptical radiation primary diffusing reflector 18. As viewed in the cross-section ofFIG. 2 , which is section perpendicular to the extent of the display panel, theprimary diffusing reflector 18 is straight and thesecondary diffusing reflector 19 is concave. Theprimary diffusing reflector 18 and thesecondary diffusing reflector 19 are preferably made of an opaque material, such as but not limited to ABS, which has a high diffusive reflection coefficient at the wavelengths of the light sources. - As can be seen most clearly in
FIG. 2 , theprimary diffusing reflector 18 extends perpendicularly away from thedisplay panel 2. TheLEDs 5 are mounted on a common printed circuit board (PCB) carrier 6, with an emittingside 22 of each of theLEDs 5 facing directly towards theprimary diffusing reflector 18. The emittingside 22 of each of theLEDs 5 is separated from theprimary diffusing reflector 18 by agap 24 of about 3 mm. However, other gap distances may be used. -
FIG. 1 illustrates the primary andsecondary diffusing reflectors display panel 2, with both the primary andsecondary diffusing reflectors display panel 2 and the carrier 6. As shown, theLEDs 5 are evenly spaced apart in a concentric arrangement between the arcs of the diffusingreflectors - In certain embodiments, the
display unit 1 is a dial display unit including apointer indicator 30 and a motive means 28 for rotationally moving thepointer indicator 30. As a non-limiting example, the motive means 28 is a stepper motor for controlling the rotational movement of thepointer 30, wherein thepointer 30 indicates thegraphical information 3 on thedisplay panel 2. As shown, thedial display unit 1 is a motor vehicle speedometer and the graphical information is the indicated speed of the vehicle. However, other display units and graphical information may be use. As a non-limiting example, the motive means 28 is mounted on the same PCB 6 as used to mount theLEDs 5, and is located inside the arc of theprimary diffusing reflector 18. Additionally, the space in which the motive means 28 is housed is bounded laterally by theprimary diffusing reflector 18. - In use, the
LEDs 5 generate theoptical radiation 16 which is directed by the diffusingreflectors display panel 2. Additionally, the motive means 28 sweeps thepointer 30 over an angle of thedisplay panel 2 over which thegraphical information 3 extends. As a non-limiting example,graphical information 3 may extend over approximately 280 degrees of thedisplay panel 2. As such, theLEDs 5 and primary andsecondary diffusers LEDs 5 and the primary andsecondary diffusers - Both the PCB carrier 6 and the
display panel 2 are planar and parallel with each other and separated by agap 26 of about 15 mm. Theprimary diffusing reflector 18 therefore extends substantially perpendicularly between thedisplay panel 2 and the PCB carrier 6. The emittingside 22 of eachLED 5 is therefore perpendicular to the plane of thedisplay panel 2 and parallel with theprimary diffusing reflector 18. As a result, the emittingside 22 of theLED 5 faces in a lateral direction with respect to the extent of thedisplay panel 2 and towards theprimary diffusing reflector 18 so that optical radiation from eachLED 5 falls initially on theprimary diffusing reflector 18. - The use of predominantly lateral diffusion of the
optical radiation 16 helps to minimize the size of thedisplay unit 1 in the direction transverse to thedisplay panel 2. As an example, the vehicular main gauge described above requires four to sixLED light sources 5 for a typical architecture profile of 15 mm depth (distance between the PCB carrier 6 and the appliqué graphics 15). Even with fourLED light sources 5 the invention will in many cases achieve better illumination homogeneity than conventional illumination systems within a reduced depth profile. - The present invention therefore provides a convenient, economical back-lit
display unit 1, with good illumination homogeneity and within a compact depth profile, for example for use in vehicle instrument clusters. - The invention helps to reduce the number of
LED 5 sources while maintaining good illumination evenness. The present invention preferably uses a side-emitting type LED to obtain uniform illumination. As shown in the attached drawings, the side-emittingLEDs 5 are placed on the PCB carrier 6 and oriented in such a way that the emittedlight 16 undergoes multiple reflections and diffusion towards thedial display plate 2 so that back-light illumination 8 is evenly distributed and a uniform illumination of the information graphicalinformation display area 3 is achieved. - The invention also benefits from the use of a common PCB carrier 6 that supports the
LEDs 5 in an orientation in which theoptical radiation 16 is emitted towards theprimary diffusing reflector 18 and away from the graphicalinformation display area 3. The carrier 6 is also used as one of the supports for the primary andsecondary diffusers optical radiation 16 can be coated with a reflective coating (not shown) to aid diffusion of theoptical radiation 16 towards thegraphical information areas 3. The primary andsecondary diffusing reflectors display panel 2, and optionally also a reflective coated carrier 6 therefore form an efficient “light box” type of optical diffusing system. - The present invention also provides ample space around the
pointer 30, which can be used to house warning lights or other display components - The invention therefore provides a number of benefits over certain prior art gauges or other types of display, and achieves a reduction in the number or LED light sources, in this example to four, whilst maintaining even illumination across the graphical display area of a display panel. This, together with a relatively simple construction helps to reduce manufacturing cost.
- From the foregoing description, one ordinarily skilled in the art can easily ascertain the essential characteristics of this invention and, without departing from the spirit and scope thereof, make various changes and modifications to the invention to adapt it to various usages and conditions.
Claims (20)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0811866.3 | 2008-06-27 | ||
GB0811866A GB2461316A (en) | 2008-06-27 | 2008-06-27 | Back-lit Display |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090323311A1 true US20090323311A1 (en) | 2009-12-31 |
Family
ID=39683322
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/436,429 Abandoned US20090323311A1 (en) | 2008-06-27 | 2009-05-06 | Side-emitting led display |
Country Status (2)
Country | Link |
---|---|
US (1) | US20090323311A1 (en) |
GB (1) | GB2461316A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120134139A1 (en) * | 2010-11-25 | 2012-05-31 | Jang Ji Won | Backlight unit and display apparatus using the same |
US20140080406A1 (en) * | 2012-09-19 | 2014-03-20 | Sundial Energy, Inc. | Renewable uninterrupted power supply for critical node infrastructure support |
US20150092389A1 (en) * | 2013-10-01 | 2015-04-02 | Denso Corporation | Prism for light reflecting/diffusion between led's |
US20150298609A1 (en) * | 2012-11-13 | 2015-10-22 | Johnson Controls Technology Company | Illuminated vehicle interior component |
US20150343946A1 (en) * | 2010-06-23 | 2015-12-03 | Trw Automotive Electronics & Componets Gmbh | Symbol display element for a vehicle interior |
JP2017015579A (en) * | 2015-07-01 | 2017-01-19 | 株式会社デンソー | Display |
USD951973S1 (en) | 2020-01-21 | 2022-05-17 | Marshall Excelsior Co. | Display screen with animated images |
USD972426S1 (en) * | 2020-01-21 | 2022-12-13 | Marshall Excelsior Co. | Gauge |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140085918A1 (en) * | 2010-12-16 | 2014-03-27 | Johnson Controls Interiors Gmbh Co. Kg | Device for interior lighting in a motor vehicle |
ES2732764B2 (en) * | 2018-05-24 | 2020-11-26 | Seat Sa | Lighting module for a vehicle |
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US20030095398A1 (en) * | 1996-01-16 | 2003-05-22 | Parker Jeffery R. | Light emitting panel assemblies for use in automotive applications and the like |
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JP2004301533A (en) * | 2003-03-28 | 2004-10-28 | Denso Corp | Pointer instrument for vehicle |
JP4566728B2 (en) * | 2004-07-01 | 2010-10-20 | 株式会社デンソー | Pointer instrument |
JP4609239B2 (en) * | 2005-03-17 | 2011-01-12 | 株式会社デンソー | Display device |
GB2435933B (en) * | 2006-03-08 | 2011-01-05 | Visteon Global Tech Inc | Illuminated instrument |
-
2008
- 2008-06-27 GB GB0811866A patent/GB2461316A/en not_active Withdrawn
-
2009
- 2009-05-06 US US12/436,429 patent/US20090323311A1/en not_active Abandoned
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US3568630A (en) * | 1969-02-26 | 1971-03-09 | Lewis Eng Co | Illuminated indicator means and instrument |
US5949346A (en) * | 1995-06-07 | 1999-09-07 | Toyoda Gosei Co., Ltd. | Light-driven display device |
US20030095398A1 (en) * | 1996-01-16 | 2003-05-22 | Parker Jeffery R. | Light emitting panel assemblies for use in automotive applications and the like |
US6461006B1 (en) * | 1999-09-01 | 2002-10-08 | Denso Corporation | Measuring instrument with an indicator |
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Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10088126B2 (en) * | 2010-06-23 | 2018-10-02 | Trw Automotive Electronics & Components Gmbh | Symbol display element for a vehicle interior |
US20150343946A1 (en) * | 2010-06-23 | 2015-12-03 | Trw Automotive Electronics & Componets Gmbh | Symbol display element for a vehicle interior |
US9140426B2 (en) | 2010-11-25 | 2015-09-22 | Lg Innotek Co., Ltd. | Backlight unit and display apparatus using the same |
US20120134139A1 (en) * | 2010-11-25 | 2012-05-31 | Jang Ji Won | Backlight unit and display apparatus using the same |
US20140036477A1 (en) * | 2010-11-25 | 2014-02-06 | Lg Innotek Co., Ltd. | Backlight unit and display apparatus using the same |
US8985798B2 (en) * | 2010-11-25 | 2015-03-24 | Lg Innotek Co., Ltd. | Backlight unit and display apparatus using the same |
US8556442B2 (en) * | 2010-11-25 | 2013-10-15 | Lg Innotek Co., Ltd. | Backlight unit and display apparatus using the same |
US9293948B2 (en) * | 2012-09-19 | 2016-03-22 | Sundial Energy, Inc. | Renewable uninterrupted power supply for critical node infrastructure support |
US20140080406A1 (en) * | 2012-09-19 | 2014-03-20 | Sundial Energy, Inc. | Renewable uninterrupted power supply for critical node infrastructure support |
US20150298609A1 (en) * | 2012-11-13 | 2015-10-22 | Johnson Controls Technology Company | Illuminated vehicle interior component |
US20150092389A1 (en) * | 2013-10-01 | 2015-04-02 | Denso Corporation | Prism for light reflecting/diffusion between led's |
US9205775B2 (en) * | 2013-10-01 | 2015-12-08 | Denso International America, Inc. | Prism for light reflecting/diffusion between LED's |
DE102014112998B4 (en) | 2013-10-01 | 2022-01-20 | Denso Corporation | instrument cluster |
JP2017015579A (en) * | 2015-07-01 | 2017-01-19 | 株式会社デンソー | Display |
USD951973S1 (en) | 2020-01-21 | 2022-05-17 | Marshall Excelsior Co. | Display screen with animated images |
USD972426S1 (en) * | 2020-01-21 | 2022-12-13 | Marshall Excelsior Co. | Gauge |
Also Published As
Publication number | Publication date |
---|---|
GB2461316A (en) | 2009-12-30 |
GB0811866D0 (en) | 2008-07-30 |
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